Clasp



A. CORNU.

CLASP.

APPLICATION FILED IUNEII. 1920.

1,364,724. Patented Jan. 4,1921.

3 c5 d im a AMI CORNU, OF LA CHAUX-DE-FONDS, SWITZERLAND.

CLASP.

Application iled` .Tune 11,

To all whom it may concern Be it known that I, AMI -CoRNU, citizen` ofSwitzerland, residing at La Chaux-de- Fonds, Canton of Neuchtel, inl theConfederation of Switzerland, have invented certain new and usefulImprovements in Clasps, of which the following is a specification.

The object of the invention is an unfold-` able clasp for a number ofelements which are connected with one another by suitable means, so asto allow the said elements to be either placed in one line, when theyare unfolded, with a view of stretching the bracelet enough to be ableto be slipped over the wearers hand, or folded upon each other, when theclasp is to be closed, so as to fit exactly the wrist of its bearer.

The invention is shownin the accompanying drawings in which:

Figure 1 is a top-view of one construction involving the invention, theclasp being closed.

Fig. 2 is a longitudinal section in side View of Fig. 1.

Fig. 3 is a longitudinal section of the un. folded clasp.

Fig. 4 is a longitudinal section of the clasp, when the elements of thesame are on their way to be closed.

Fig. 5 is a side elevation of a longitudinal section of the clasp andFig. 5au a face-view of the same, hinged to the loop of a wristwatch.

The clasp shown in Figs. 1 to 4 is formed of 3 members a, b, and cconnected with one another, so as to be able to be unfolded and place-dend to end, as shown in Figs. 3 and 4, or folded on one another as shownin Figs. 1 and 2. In the first instance, the. unfolded clasp allows thebracelet to be extended sufiiciently for being slipped over the hand ofits bearer, in the second instance on the contrary the bracelet litsexactly the wrist and cannot be slipped over the hand.

The middle member a is connected to the other two members b and c bymeans of the pivots al and a?. These pivots are respectively engaged inthe hooked portion of the springs b1 and c1 fixed to the parts Z1 and crespectively by means of rivets b2 and c2 respectively. The part c isprovided with a knob or button d xed to the same by means Specificationof Letters-Patent.

1920. Serial No. 388,167.

of'the lsame rivet c2 mentioned before and 1s intended to be seizedbetween two fingers for the purpose of unfolding the clasp.

The parts b and c are provided with suitable depressions b3 and c3 intowhich the ends of the hooked springs b1 and c1, engage whenever the fiatportion of the pivots al and a2 -are adjacent to the said springs, asshown 1n Fig. 2 with the object of holding the three parts a, b, and cin their' folded position. v

The free ends of the parts a, l) and c are hooked to the two extremitiesof the bracelet to which the clasp belongs.

Supposing the bracket to be fitted to the wrist of a person one needsonly to seize the knob or button d between two fingers and to pull` thesame'. The parts will then first be brought into the position shown inFig. 4 and be extended to the position shown in Fig. 3 in which thebracelet may be slipped over ones wrist. In this position of the partsthe flat portion of the pivots'af,1 and a2 are pressed by the springs b1and c1 against the inner face of the parts b and c, so as to maintainthe clasp in its unfolded position as shown in Fig. 3. The clasp may beshut again by moving the parts a, b and c inversely from their positionof Fig. 3 first into their position of Fig. 4 and then again into theirposition of Fig. 2.

Fig. 5 shows a modified construction of the same device, attached to awrist-watch. This construction differs from the just described one onlyby its part b provided with a broad hook b4 intended to be hooked to theloop of a wrist-watch of any well known construction whatever as shownin Fig. 5a.

yThe operation of this construction is exactly the same as the one justdescribed with reference to the Figs. 1 to 4.

The forms and `dimensions of theparts a, b and c and of the springs'acting upon the same may vary and the number of the parts forming theunfoldable clasp may Aalso vary according to the length to be obtainedfor the extended bracelet.

4I claim:

1. A bracelet clasp and the like comprising pivotally connected members,and resilient devices connected to certain of the pivotally mountedmembers and coacting with the pivots thereof for yieldingly main-Patentea Jan. 4, 1921.`

taining the members of the clasp in both a closed and open position.

2. A bracelet clasp and the like comprising a plurality of members,pivots connecting the adjacent ends of the said members, and resilientdevices coacting with the said pivots for yieldingly maintaining thesaid members in both anopen and closed position.

3. A bracelet clasp and the like comprising three ivotally connectedmembers, and resilient -evices secured to predetermined members andcoacting .with the pivots by which the said members are connected foryieldingly maintaining the said members in' an open and also in a closedposition.

4. A bracelet clasp and the like comprising a central and two outermembers, pivots connecting the ends of the central member with theadjacent ends of the outer members, predetermined portions of the .saidpivots being flattened, and resilient means coacting with the saidpivots and flattened portions thereof for yieldingly maintaining theparts in both an open and closed position.

5. A bracelet clasp and the like comprising a central and two outermembers, pivots connecting the ends'of the central member with theadjacent ends of the outer members, lpredetermined portions of the said'pivots being flattened, and hook spring members connected respectivelyto the said outer members and having U-shaped hooks at their extremitiesadapted to enga-ge the flattened portions of the pivots when the. partsof the clasp are closed and to coact with the pivots to yieldinglymaintain the flattened surfaces thereof against the adjacent inner facesof .the outer members when the parts of the clasp are in an openposition.A

In testimonyT whereof I alix my signature in presence of two witnesses.AMI CORNU.

Witnesses:

' G. WUER SCHREINER,

MANNE WUER.

